Which church is described as having "fallen asleep"?

The church described as having "fallen asleep" is Sardis. This phrase is used in the context of Revelation 3:1-6, where the church in Sardis is admonished for being spiritually dead despite appearing to be alive. The imagery of "falling asleep" signifies a lack of vigilance, awareness, or spiritual vitality that the congregation possesses. The church is warned to wake up and strengthen what remains, indicating there are still aspects of faith to be revived.

In contrast, the other churches mentioned in the options address different issues or commendable aspects in their contexts. For instance, Philadelphia is praised for its faithfulness and endurance, while Ephesus is noted for having lost its first love despite its hard work and perseverance. Laodicea is characterized by being lukewarm, lacking in zeal, and needing to take action to restore its relationship with Christ. The specific terminology "fallen asleep" distinctly refers to Sardis, illustrating the unique challenges faced by that particular church.